Clash of Clans and Hay Day are both among the top-ten grossing apps in the iTunes Store, according to AppData. Supercell generates over $2.4 million per day in revenue, on average, according to data released earlier this year.

Business Insider recently had the chance to visit Supercell in Helsinki.

Note: Supercell would not allow us to take photos of its employees, nor their screens.

Disclosure: Finnish funding agency Tekes and Finnfacts, a non-profit media service organization in Finland, paid for my trip to Helsinki to explore the startup scene.

Supercell has space at Itämerenkatu 11 in Helsinki, Finland.

Here's the view from the inside. Only a couple of startups currently occupy the building. Another notable startup that resides here is Jolla, a smartphone company that spun out of Nokia.

When you first walk inside Supercell, you'll see an interactive screen that displays real-time user logins.